Anthraquinone compounds and a process for their manufacture



Patented Get. 9, 1945 ANTHRAQUINONE 1 COMPOUNDS AND- A PROCESS FOR THEIR MANUFACTURE Ernst Gutzwiller, Basel, Switzerland, assignor to Sandioz Ltot, Fribourg, Switzerland, a Swiss No Drawing. Application November 29; 1943, Serial No. 512,243. In Switzerland December 4 Claims. (01. 2 379) The present invention relates to new anthraquinone compounds which are valuable dyestuffs for dyeing wool, silk and nylon in pure blue shades which are stable to light and do not change their shade into red in artificial light, .and to a process for their manufacture. I

From the British Specification 546,383 it has become known that anthraquinone compounds containing in their molecule replaceable groups can be condensed with amino alcoholsv of the general formula wherein R. and R1 stand for a member of the wherein R stands for alkyl, R1 stands for alkylene and R2 for hydrogen or an SOaI-I. group, and in case they are water-insoluble, by transforming them into the respective sulfuric acid esters by treatment with sulfonating agents.

The new dyestuffs prepared accordingto the present invention are differentiated from those described in the above cited British specification by their better fastness to light and the property of not changing the shade in artificial light.

As replaceable substituents that stand in 1- and 4-position of the'anthraquinone molecule, the following ones may be-cited: halogen, nitro, hydroxy, alkoxy, amino, .alkylamino, arylamino and sulfuric acid group. Therefore, the following anthraquinone compounds can be used for the condensation: halogenoanthraquinones like 1 :4:6-trihalogenoanthraquinones, 1 :4 :6 :7-tetrahalogenoanthraquinones; 1:4-dihydroxy-6-halogenoanthraquinone, 1 :4 dihydroxy 6:7-diha1ogenoanthraquinone, 1-hydroxy-4-amino-6 or -7- halogeno or -6:7-dihalogenoanthraquinone respectively, 1:4-diamino-6-halogenoor -6:7-dihalogenoanthraquinone and the leuco compounds 7 of the above cited derivatives.

As amino alcohols there may be used for instance 2-amino-propanol-1, 2-aminobutanol-1, 2-

aminopen'tanol-l, 3-aminobutanol-1, 2-aminopropandiol-l :3 and alsotheir isomers with ramified carbon chain. These amino alcohols can further be substituted, thus containing for'example halogen, sulfo or phosphoric acid groups or they can be esterified at the hydroxy group by sulfuric or phosphoric acid. As the anthraquinone compounds used for the condensation contain two replaceable substituents in the aposition, different amino alcohols can be employed in molecular proportions, simultaneously or one after the other, for the condensation, whereby products containing different hydroxyalkylamino chains are obtained.

The following examples, without being limitative, describe the present invention, the parts being by weight:

I Example 1' '10 parts of leuco-fi-chloroduinizarine, 8 parts of Z-aminopropanol-l and 50 parts of ethanol are stirred together at 60-80 C. until the condensation is finished. The leuco compound thus obtained is oxidized by means of an air stream, whereby it is advantageousv to add to the mixture some piperidine and copper acetate. After cooling down the new compound is filtered and, washed with ethanol. The 1:4-di- (propanol-l'e amino-2) -6-chloroanthraquinone dissolves in organic solvents with a brilliant blue coloration.

10 parts of the condensation product are dissolved while cooling in 40 parts of. concentrated sulfuric acid of SKI-% strength. When a sample taken out shows that the product is easily soluble in water, the sulfonation mass is poured onto ice. Then after having separated the sulfuri c acid by chalking, the dyestuif is separated from the mother-lye by salting out or evapor tion to dryness.

The new compound possesses the formula era-on-om-osora CHa-(ElI-CHr-OSOaH and dyes wool and other textile fibres in very brilliant blue shades being fast to light.

Instead of the leuco-fi-chloroquinizarine a mixture of leuco-6-chloroquinizarme and of 6-chloroquinizarine can be used for the condensation.

none will be obtained. This condensation product gives, after treatment with concentrated sulfuric acid, a dyestufi dyeing wool in greener shades as compared to the monochloro derivative. 1

Example 2 n 5 parts of leuco-6-quinizarine, 5 parts of 6- chloroquinizarine, 15 parts of 2-aminobutanol-1 and 50 parts of ethanol are stirred together at 50-80 C, until the condensation has completed. After oxidation with an air stream the condensation product is isolated in the manner described in Example 1. After treating it with 3-6 times itsweight ofconcentrated sulfuric acid of 90- 10 0:% strength or with weak oleum, preferably while cooling, a dyestufi will be'obtained dyeing wool ;in very brilliant 'blue shades which are somewhat greener and faster than the dyestuff prepared according to Example 1. It corresponds to the formula It seems that the fastness properties of the dyestuffs. become better, Whenthe hydro-oxyalkylamine chain becomes longer.

Example 3 sulfuric acid of 90 100% strength, preferably while cooling, a dyestuff'possessing the formula CHa-CH2CHCHgOS-Q3H onrcriron onro s 0313 will be obtained. It dyes wool in very brilliant blue'shades that are greener than those obtained according to Example 2.

Example 4 12 parts of leuco-fi-chloroquinizarine, 18 parts of the sodium salt of the sulfuric acid ester of 2- aminobutanol-l, 80 parts of ethanol and 12 parts of water are stirred at 50-80 C. until the condensation has completed. After having oxidised 5 the mixture with an air stream, if desired in presence of piperidineor pyridine or dimethylaniline and some copper acetate, the dyestuff is filtered off and washed with alcohol and if desired purified by crystallisation. It is identical with the dyestufl of Example 2.

What I claim is: 1. New. water-soluble anthraquinone pounds of the general formula com- X 20 o NH R-( H-RiOS0aH wherein R stands for alkyl, R1 stands for alkylene, X stands for halogen and Y stands for a member selected from the group consisting of halogen and hydrogen, which dyestuifs dye wool, silk and nylon in brilliant blue shades being fast to lightand not changing to red in artificial light. 2. The new water-soluble dyestuff of the for- I mula The new water-soluble dyestufi of the formula 

